Fair Value of Financial Instruments - Additional Information (Detail) - CAD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2026	Apr. 30, 2025
Disclosure of detailed information about financial instruments [line items]
Derivative liabilities transferred into Level 3		$ 0		$ 0
Obligations Relating To Short Selling Of Securities [Member]
Disclosure of detailed information about financial instruments [line items]
Liabilities transferred out of level two into level one	$ 943	1,038	$ 111	165
Liabilities transferred out of level one into level two	213	832	183	305
Equity Contracts [member]
Disclosure of detailed information about financial instruments [line items]
Transfers out of level 3 into level 2 of fair value hierarchy assets	65		90
Trading assets [member]
Disclosure of detailed information about financial instruments [line items]
Assets transferred out of level two into level one	953	2,003	648	842
Assets transferred out of level one into level two	1,637	913	1,651	706
Investment Securities [Member]
Disclosure of detailed information about financial instruments [line items]
Assets transferred out of level two into level one	6,562	6,624	595	1,330
Assets transferred out of level one into level two	$ 550	$ 463	$ 2,823	$ 1,547

Transfers out of level 3 into level 2 of fair value hierarchy assets.

No definition available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of transfers of liabilities into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph e
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_iv&doctype=Standard
-URIDate 2025-03-27

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- Definition

The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_c&doctype=Standard
-URIDate 2025-03-27

+ Details

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- Definition

The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

+ Details

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- Definition

The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

+ Details

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- Definition

The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

+ Details

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